Istanbul's Digital Archives Are Drowning in Duplicate Images — Here Are the Numbers

At least 40 percent of image files stored across Istanbul's major municipal and cultural digital archives are estimated to be duplicates or near-identical copies, according to internal assessments reviewed by technology consultants working with the Istanbul Metropolitan Municipality's IT directorate. The figure has sharpened a long-running debate about digital asset management at a time when Turkey's public institutions are being pushed to trim operational spending.

The problem sounds mundane. It is not. As Istanbul's tourism infrastructure expands — the city received roughly 20 million international visitors in 2024, according to the Turkish Statistical Institute — the photographic libraries maintained by bodies like the Istanbul Culture and Tourism Directorate and the Atatürk Cultural Centre on Taksim Square have ballooned without any systematic deduplication policy in place. Storage costs compound annually, and with the Turkish lira remaining under pressure, every unnecessary gigabyte carries a real price tag.

What the Data Actually Shows

Digital storage is not cheap in Turkey's current economic environment. Commercial cloud storage contracts reviewed in the sector price enterprise-grade archival space at roughly 180 to 220 Turkish lira per gigabyte per month for institutions operating outside central government procurement frameworks. For a mid-sized cultural archive carrying an estimated 30 to 40 terabytes of images — a realistic figure for a body like the Istanbul Archaeological Museums complex in Sultanahmet — duplicate inflation can add tens of thousands of lira in monthly overhead.

The deduplication challenge is partly structural. When the Fatih Municipality digitised its historic neighbourhood survey records covering areas including Zeyrek and Fener between 2021 and 2023, multiple departments uploaded the same photographic sets independently. No single metadata standard governed file naming, so automated duplicate-detection tools failed to flag overlapping content. The result: hundreds of identical images of the same Byzantine-era facades sitting across separate servers, uncatalogued and unsearchable.

Tourism platforms have a parallel problem. Several agencies operating out of the Grand Bazaar district — where digital marketing has become essential following the post-pandemic recovery — have reported that image libraries shared between marketing teams and logistics coordinators routinely multiply without oversight. A single high-resolution photograph of the Süleymaniye Mosque can exist in six or seven iterations across one company's shared drives, each slightly resized or recompressed, none tagged consistently.

What Comes Next for Istanbul's Image Infrastructure

The Istanbul Metropolitan Municipality launched a broader Smart City Initiative in early 2025 that nominally includes digital asset rationalisation as a workstream. Whether image deduplication gets resourced within that framework is still unsettled. Technology vendors who pitched to the municipality's procurement office in the first quarter of 2026 have proposed AI-assisted deduplication tools that scan for perceptual similarity rather than just identical file hashes — the latter method misses the resized and recompressed variants that make up the bulk of the problem.

Perceptual hashing tools, which compare images based on visual content rather than file metadata, can reduce duplicate libraries by 35 to 60 percent in a single pass, according to published benchmarks from similar projects run in Barcelona and Amsterdam. Istanbul's archives, given their volume and the inconsistency of past cataloguing, sit at the higher end of that range for potential reduction.

For smaller institutions — the neighbourhood municipalities in districts like Beyoğlu and Kadıköy, or heritage NGOs working along the Golden Horn waterfront — the practical advice from digital archivists is straightforward: adopt a single metadata standard before the next upload cycle begins, not after. Retrofitting is exponentially more expensive than prevention. One consultant working with a Karaköy-based cultural foundation put the cost differential at roughly four to one in staff hours.

The pressure to act is real. With municipal budgets already stretched by earthquake-preparedness obligations following the 2023 Kahramanmaraş disaster, and with inflation eating into every line item, Istanbul's digital housekeeping is no longer an IT footnote. It is a fiscal question — and the numbers are starting to demand an answer.